50 lines
1.9 KiB
Diff
50 lines
1.9 KiB
Diff
From 61d0326a5b1c11a8f2e8e31ec9093e81daa26588 Mon Sep 17 00:00:00 2001
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From: David Herrmann <dh.herrmann@gmail.com>
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Date: Thu, 2 Oct 2014 19:47:21 +0200
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Subject: [PATCH] terminal/unifont: add built-in fallback glyph
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In case we cannot render a glyph, we want a fallback we can display
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instead. If we rely on the font itself to provide the fallback character,
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we have nothing to display if that character is not available. Therefore,
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add a static fallback that we can use at any time.
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---
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src/libsystemd-terminal/unifont.c | 18 ++++++++++++++++++
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src/libsystemd-terminal/unifont.h | 1 +
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2 files changed, 19 insertions(+)
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diff --git a/src/libsystemd-terminal/unifont.c b/src/libsystemd-terminal/unifont.c
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index 7520015988..2acfa9821a 100644
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--- a/src/libsystemd-terminal/unifont.c
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+++ b/src/libsystemd-terminal/unifont.c
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@@ -221,3 +221,21 @@ int unifont_lookup(unifont *u, unifont_glyph *out, uint32_t ucs4) {
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memcpy(out, &g, sizeof(g));
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return 0;
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}
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+
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+void unifont_fallback(unifont_glyph *out) {
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+ static const uint8_t fallback_data[] = {
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+ /* unifont 0xfffd '<27>' (unicode replacement character) */
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+ 0x00, 0x00, 0x00, 0x7e,
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+ 0x66, 0x5a, 0x5a, 0x7a,
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+ 0x76, 0x76, 0x7e, 0x76,
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+ 0x76, 0x7e, 0x00, 0x00,
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+ };
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+
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+ assert(out);
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+
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+ out->width = 8;
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+ out->height = 16;
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+ out->stride = 1;
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+ out->cwidth = 1;
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+ out->data = fallback_data;
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+}
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diff --git a/src/libsystemd-terminal/unifont.h b/src/libsystemd-terminal/unifont.h
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index 0ded61472f..30527cb3fa 100644
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--- a/src/libsystemd-terminal/unifont.h
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+++ b/src/libsystemd-terminal/unifont.h
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@@ -54,3 +54,4 @@ unsigned int unifont_get_width(unifont *u);
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unsigned int unifont_get_height(unifont *u);
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unsigned int unifont_get_stride(unifont *u);
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int unifont_lookup(unifont *u, unifont_glyph *out, uint32_t ucs4);
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+void unifont_fallback(unifont_glyph *out);
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